“overflow: hidden” is often used for the purpose of float containment. It can do more special things, however: prevent an element's margins from collapsing with its children and prevent an element from extending “behind” an adjacent floated element.

The Tin Can API (sometimes known as the Experience API or xAPI) is a brand new specification for learning technology that makes it possible to collect data about the wide range of experiences a person has (online and offline). This API captures data in a consistent format about a person or group’s activities from many technologies. Very different systems are able to securely communicate by capturing and sharing this stream of activities using Tin Can’s simple vocabulary.